read-keys.py

#!/usr/bin/env python

import array

from lib.hiddev import HIDDEV
from lib.util import BIT_MASKS
from lib.eightkbd import VENDOR_ID, PRODUCT_ID, INTERFACE_NUM, OUT_ID, IN_ID, CMD_ENABLE_KEYMAP, CMD_DISABLE_KEYMAP, get_name_from_bitfield_code

def listen_callback(hid, last_report, report_id, data):
    if last_report[0] != (report_id, data):
        for num, byte in enumerate(data[3:]):
            for bit in range(8):
                if byte & BIT_MASKS[bit]:
                    val = (num * 8) + (7 - bit)
                    print(f" {val}/{val:02X} {get_name_from_bitfield_code(val)}")
        last_report[0] = (report_id, data)
    return True

with HIDDEV(VENDOR_ID, PRODUCT_ID, INTERFACE_NUM) as hid:
    buf = hid.generate_report(OUT_ID, CMD_ENABLE_KEYMAP)
    print(hid.decode(buf[0], buf[1:]))
    hid.write(buf)

    last_report = [None]
    try:
        hid.listen(-1, listen_callback, last_report)
    except KeyboardInterrupt:
        buf = hid.generate_report(OUT_ID, CMD_DISABLE_KEYMAP)
        print(hid.decode(buf[0], buf[1:]))
        hid.write(buf)